Data transmitting and receiving apparatus and method, and solid state drive including the same

ABSTRACT

A data transmitting and receiving apparatus includes a coil configured to transmit and receive data through inductive coupling, where a voltage drop across the coil constitutes a sensing signal. The apparatus further includes an input unit configured to generate transmission data and a replica signal in accordance with an input data signal, the transmission data being supplied to the coil. The apparatus still further includes a replica unit configured to generate a compensation signal in accordance with the replica signal, and an output unit configured to extract reception data from the sensing signal using the compensation signal.

CROSS-REFERENCE TO RELATED APPLICATIONS

A claim of priority under 35 USC §119 is made to Korean Patent Application No. 10-2011-0127409, filed on Dec. 1, 2011, the entirety of which is hereby incorporated by reference.

BACKGROUND

The present general inventive concept generally relates to the transmission and reception of data, and more particularly, the invention concept relates to the utilization inductive coupling to transmit and receive data.

Inductive coupling is utilized as a type of near field contactless communication technology. When compared to other near field contactless communication technologies, such as radiofrequency identification (RFID), inductive coupling advantageously exhibits relatively high transmission rates and low power consumption.

In addition to contactless communication between separate devices, inductive coupling may be utilized within a device, such as solid-state drive (SSD), where a plurality of integrated circuits (ICs) is stacked in a single package. Here, inductive coupling may be used to realize data communication between the stacked ICs.

One drawback of conventional inductive coupling techniques is that there are not capable of simultaneously performing interactive communication over a single channel. This is primarily because echo noise generated by inductance is not effectively eliminated during the interactive communication. For example, an integrated circuit that is transmitting data must stop transmission in order to receive data. Accordingly, interactive communication utilizing conventional inductive coupling is performed through timing control, which can narrow the effective bandwidth.

SUMMARY

In an aspect of embodiments of the inventive concept, a data transmitting and receiving apparatus includes a coil configured to transmit and receive data through inductive coupling, where a voltage drop across the coil constitutes a sensing signal. The apparatus further includes an input unit configured to generate transmission data and a replica signal in accordance with an input data signal, the transmission data being supplied to the coil. The apparatus still further includes a replica unit configured to generate a compensation signal in accordance with the replica signal, and an output unit configured to extract reception data from the sensing signal using the compensation signal.

In another aspect of the inventive concept, a data transmitting and receiving method includes receiving an input data signal, generating a transmission data and a replica signal in accordance with the input data signal, and transmitting the transmission data inductively via an induction coil and receiving reception data inductively via the induction coil, where a voltage drop across the coil constitutes a sensing signal. The method further includes generating a compensation signal in accordance with the replica signal, and extracting the reception data from the sensing signal using the compensation signal.

In yet another aspect of embodiments of the inventive concept, a solid state drive (SSD) includes a plurality of stacked semiconductor chips, at least one of which is memory chip, where each of the semiconductor chips includes a contactless communication terminal. The contactless communication terminal includes a coil configured to transmit and receive data through inductive coupling, where a voltage drop across the coil constitutes a sensing signal. The terminal further includes an input unit configured to generate transmission data and a replica signal in accordance with an input data signal, the transmission data being supplied to the coil. The terminal still further includes a replica unit configured to generate a compensation signal in accordance with the replica signal, and an output unit configured to extract reception data from the sensing signal using the compensation signal.

BRIEF DESCRIPTION OF THE DRAWINGS

The inventive concept will become more apparent in view of the accompanying drawings and detailed description that follows. The embodiments depicted therein are provided by way of example, not by way of limitation, wherein like reference numerals refer to the same or similar elements. The drawings are not necessarily to scale, emphasis instead being placed upon illustrating aspects of the inventive concept.

FIG. 1 is a schematic view a data transmitting and receiving apparatus for use in describing the concept of inductive coupling.

FIG. 2 is a circuit diagram for use in describing data transmission based on inductive coupling.

FIG. 3 is a block diagram of a data transmitting and receiving apparatus according to an embodiment of the inventive concept.

FIG. 4 is a block diagram of a first input unit shown in FIG. 3 according to an embodiment of the inventive concept.

FIG. 5 is a block diagram of a first replica unit shown in FIG. 3 according to an embodiment of the inventive concept.

FIG. 6 is a block diagram of a first output unit shown in FIG. 3 according to an embodiment of the inventive concept.

FIG. 7 is a circuit diagram of a data transmitting and receiving apparatus according to another embodiment of the inventive concept.

FIG. 8 is a circuit diagram of a data transmitting and receiving apparatus according to yet another embodiment of the inventive concept.

FIG. 9 is a timing diagram of a data transmitting and receiving apparatus according to an embodiment of the inventive concept.

FIG. 10 is a schematic view of a solid state drive (SSD) according to an embodiment of the inventive concept.

DETAILED DESCRIPTION

The advantages and features of the inventive concept and methods of achieving them will be apparent from the following exemplary embodiments that will be described in more detail with reference to the accompanying drawings. It should be noted, however, that the inventive concept is not limited to the following exemplary embodiments, and may be implemented in various forms. Accordingly, the exemplary embodiments are provided only to disclose the inventive concept and let those skilled in the art know the category of the inventive concept.

In the present specification, the terms “comprise” and/or “comprising” specify existence of shapes, numbers, steps, operations, members, elements, and/or groups thereof, which are referred to, and do not exclude existence or addition of one or more different shapes, numbers, operations, members, elements, and/or groups thereof. Hereinafter, embodiments of the inventive concept will now be described more fully with reference to accompanying drawings.

Reference is initially made to FIGS. 1 and 3 for a discussion of transmission by inductive couple generally.

FIG. 1 illustrates a data transmitting and receiving apparatus 10. As shown, the apparatus 10 generally includes a first circuit unit 11 and a second circuit unit 12.

The first circuit unit 11 and the second circuit unit 12 include a first coil 11 a and a second coil 12 a, respectively. In FIG. 1, the first circuit unit 11 functions as a transmitting circuit and the second circuit 12 functions as a receiving circuit. When transmission data is provided to the first coil 11 a of the first circuit unit 11, voltage fluctuation of the first coil 11 a is transferred to the second coil 12 as an electrical signal by magnetic coupling of the first coil 11 a and the second coil 12 a. The electrical signal transferred to the second coil 12 a is output through an output terminal connected to the second coil 12 a. Near field contactless communication performed in this manner is referred to herein as inductive coupling communication.

FIG. 2 is a circuit diagram generally corresponding to the apparatus shown in FIG. 1. Here, the transmission coil 11 a is connected to a transmission terminal. The receiving coil 12 a and its parasitic resistors Ra and Rb are connected in series to a receiving terminal.

In operation, a data transmission current I_(T) is provided to the transmission coil 11 a. When the transmission current I_(T) flows through the transmission coil 11 a, a magnetic field around the transmission coil 11 a is altered. This variation in the magnetic field leads to voltage (or current) fluctuation at the receiving terminal connected to the receiving coil 12 a. A receiving terminal voltage V_(R) has a close relationship to change over time of the transmission current I_(T). Accordingly, the transmission current I_(T) may be detected from the receiving terminal voltage V_(R). A relationship between the receiving terminal voltage VR and the transmission current IT is shown below.

${{Time}\mspace{14mu} {domain}\text{:}\mspace{14mu} {V_{R}(t)}} = {M\frac{{I_{T}(t)}}{t}}$ Frequency  domain:  V_(R)(ω) = j ω MI_(T)(ω)

In these equations, t represents time, ω represents a frequency, and M represents a mutual inductance the transmission coil 11 a and the receiving coil 12 a. The mathematical relationships represented by these equations are well known in the art and are thus not explained in further detail here.

Reference is now made to FIG. 3, which is a block diagram of a data transmitting and receiving apparatus 100 according to the inventive concept. The data transmitting and receiving apparatus 100 of this example includes a first circuit unit 110 and a second circuit unit 120. The first and second circuit units 110 and 120 may each function as a transmitting unit and/or a receiving unit. Indeed, as explained below, the first and second circuit units 110 and 120 transmit and receive data at the same time.

The first circuit unit 110 includes a first input unit 111, a first replica unit 112, a first coil 113, and a first output unit 114.

The first input unit 111 provides transmission data I₁ with reference to an input signal Din1. In an exemplary embodiment, the transmission data I₁ is a current signal. The first input unit 111 provides a replica signal Rep1 with reference to the input signal Din1.

The first coil 113 transfers the transmission data I₁ to the second circuit unit 120 through inductive coupling Likewise, the first coil 113 receives a signal I₂ transmitted from the second circuit unit 120. The transmission data I₁ and the transmitted signal I₂ lead to fluctuation of a voltage at both ends of the first coil 113, respectively. The voltage at both ends of the first coil 113 is transferred to the first output unit 114 as a sensing signal V₁.

The first replica unit 112 generates a compensation signal echo1 with reference to the replica signal Rep1. As will be described later, the replica signal Rep1 has waveform corresponding to the input signal Din1. The compensation signal echo1 may have another waveform depending on the configuration of the replica unit 112.

The output unit 114 removes noise from the sensing signal V₁ with reference to the sensing signal V₁ and the compensation signal echo1. Specifically, the first output unit 114 detects a signal I₂ transferred from the sensing signal V1. The detected signal I₂ is provided as an output Dout1.

Similar to the first circuit unit 110, the second circuit unit 120 transmits and receives data through inductive coupling. The configuration and operation of the second circuit unit 120 are substantially identical to those of the first circuit unit 110 and are thus not described in further detail here.

According to the above-described configuration, transmission and reception of data may be carried out at the same time through one channel formed by magnetic coupling of the first coil 113 and the second coil 123. Thus, the data transmitting and receiving apparatus 100 exhibits a relatively high data transfer rate and effective bandwidth.

Reference is made to FIG. 4, which is a block diagram showing an embodiment of the first input unit 111 shown in FIG. 3. As shown, the first input unit 111 of this example includes a flip-flop 111 a and a driver 111 b.

The flip-flop 111 a buffers an input signal Din1 and provides the buffered signal as an output. The buffered signal is provided to a first coil 113 through the driver 111 b. The flip-flop 111 a operates in synchronization with a clock signal CLK1. In an exemplary embodiment, the flip-flop 111 a holds the input signal Din1 at the rising edge of the clock signal CLK1. The flip-flop 111 a provides the held input signal Din1 to the next rising edge of the clock signal CLK1 as an output. An output of the flip-flop 111 a is provided as a replica signal Rep1.

The driver 111 b receives the output of the flip-flop 111 a to provide transmission data I₁ to a first coil 113. Since current flowing through the first coil 113 cannot change discretely, transmission data I₁ has a slope near the rising or falling edge of the output of the flip-flop 111 a.

According to the above-described configuration, the first input unit 111 provides the transmission data I₁ to the first coil 113 with reference to the input signal Din1 and provides the replica signal Rep1 having a waveform corresponding to the transmission data I₁.

Reference is made to FIG. 5 which is a block diagram of an embodiment of the first replica unit 112 shown in FIG. 3. The first replica unit 112 of this example includes a replica driver 112 a and a compensator 112 b.

The replica driver 112 a provides a current signal to the comparator 112 b with reference to a replica signal Rep1. In an exemplary embodiment, the replica driver 112 a may function as a buffer. Also in an exemplary embodiment, the replica driver 112 a may amplify or attenuate the replica signal Rep1 and provide the amplified or attenuated signal to the compensator 112 b.

The compensator 112 b receives a current signal from the replica driver 112 a to provide a compensation signal echo1. As will be described later, the compensation signal echo1 is a signal for removing echo noise included in a sensing signal V₁. That is, the compensation signal echo1 is a signal for detecting a signal I₂ transferred from the sensing signal V₁. Specifically, the sensing signal V₁ indicates a voltage at both ends of a first coil 113. However, the voltage at both ends of the first coil 113 is changed by a transmission signal (I₁ in FIG. 1) as well as a signal transferred from a second circuit unit 120. Accordingly, noise caused by the transmission signal I₁ must be removed to detect a signal (I₂ in FIG. 1) transferred from the sensing signal V₂. As will be described later, the compensation signal echo1 has a waveform corresponding to the transmission signal I₁. Thus, the noise caused by the transmission signal I₁ may be removed by subtracting the compensation signal echo1 from the sensing signal V₁. The compensation echo1 and removal of the noise will also be described later

Reference is made to FIG. 6, which is a block diagram of an embodiment of the first output unit 114 shown in FIG. 3. The first output unit 114 of this example includes a subtractor 114 a and a hysteresis comparator 114 b.

The subtractor 114 a subtracts a compensation signal echo1 from a sensing signal V₁ and outputs a result of the subtraction.

The hysteresis comparator 114 b provides an output signal with reference to an output of the subtractor 114 a. Specifically, the hysteresis comparator 114 b removes noise that is not removed by the subtractor 114 a. For achieving this, the hysteresis comparator 114 b operates in synchronization with an enable signal enable1. In an exemplary embodiment, the hysteresis comparator 114 b holds an output of the subtractor 114 a at the rising edge of the enable signal enable1. In addition, the hysteresis comparator 114 b provides the held output to the next rising edge of the enable signal enable1 as an output.

In an exemplary embodiment, the hysteresis comparator 114 b does not hold an output of the subtractor 114 a when the output of the subtractor 114 a is lower than a first reference value and higher than a second reference value. In this case, the hysteresis comparator 114 b maintains the previously held output to a new rising edge of the enable signal enable1.

In an exemplary embodiment, the hysteresis comparator 114 b outputs a logic level HIGH when the output of the subtractor 114 a is higher than a first reference value. On the other hand, the hysteresis comparator 114 b outputs a logic level LOW when the output of the subtractor 114 a is lower than a second reference value.

According to the above-described configuration, noise may be removed from the sensing signal V₁ and a transferred signal I₂ may be detected.

Reference is made to FIG. 7, which is a circuit diagram of a data transmitting and receiving apparatus 200 according to another embodiment of the inventive concept. The data transmitting and receiving apparatus 200 includes a first terminal and a second terminal.

The first terminal of this example includes a first coil L₁, a first flip-flop 210 a, a first driver 220 a, a first replica driver 230 a, a first compensator 240 a, a first subtractor 250 a, and a first hysteresis comparator 260 a.

Similarly, the second terminal of this example includes a second coil L₂, a second flip-flop 210 b, a second driver 220 b, a second replica driver 230 b, a second compensator 240 b, a second subtractor 250 b, and a second hysteresis comparator 260 b.

The first terminal and the second terminal are substantially identical in configuration and operation. Therefore, this embodiment will be described with respect to the first terminal only.

In this embodiment, a compensation coil L_(R1) is used as the first compensator 240 a. In an exemplary embodiment, inductances of the compensation coil L_(R1) and the first coil L₁ may be equal to each other.

When an input signal Din1 is received to the first flip-flop 210 a, the first flip-flop 210 a buffers the input signal Din1 and outputs the buffered signal. The first flip-flop 210 a operates in synchronization with a clock signal CLK1. The output of the first flip-flop 210 a is provided to the first driver 220 a and the first replica driver 230 a.

The first driver 220 a outputs transmission data I₁ with reference to the first flip-flop 210 a. The transmission data I₁ may be a current signal. When the transmission data I₁ flows through a coil, the transmission data I₁ is transferred to the second terminal by inductance coupling.

The first replica driver 230 a outputs replica current I_(R1) with reference to the first flip-flop 210 a. The replica current I_(R1) is provided to the first compensator 240 a. When the replica current I_(R1) flows through the compensation coil L_(R1), a voltage is induced at both ends of the compensation coil L_(R1) by electromagnetic effect.

The first subtractor 250 a receives a voltage at both ends of the first coil L₁ as a sensing signal V₁. In addition, the first subtractor 250 a receives the voltage at both ends of the compensation coil L_(R1) as a compensation signal echo1.

Hereinafter, an operation principle of the first subtractor 250 a will now be described. First, components of the sensing signal V₁ are analyzed. At this point, the transmission data I₁ flows through the first coil L₁. Accordingly, the sensing signal V₁ includes a voltage drop caused by the transmission data I₁ and parasitic resistance, and a voltage drop caused by the transmission data I₁ and magnetic inductance of the first coil L₁.

The first coil L₁ is coupled with the second coil L₂ by mutual inductance M. Accordingly, the sensing signal V₁ includes voltage drop caused by the current I₂ flowing through the second coil L₂ and the mutual inductance M.

Next, components of a compensation signal echo1 are analyzed. The replica current I_(RI) flows through the compensation coil L_(RI). Accordingly, the compensation signal echo1 includes a voltage drop caused by the replica current I_(R1) and parasitic resistance, and a voltage drop caused by the replica current I_(R1) and magnetic inductance of the compensation coil L_(RI).

Since the compensation coil L_(RI) is not coupled with the second coil L₂, the compensation signal echo1 is not affected by mutual inductance.

In the meantime, since outputs of the driver 220 a and the first replica driver 230 a are identical to each other, their output waveforms are also identical to each other. In an exemplary embodiment, the intensity of the replica current I_(R1) may be made equal to that of the transmission data I₁ through appropriate scaling. Further, the inductance of the compensation coil L_(RI) may be set to be equal to that of the first coil L₁.

In this case, the compensation signal echo1 is made identical to a signal except for a component based on the mutual inductance M among the components of the sensing signal V₁.

The first subtractor 250 a subtracts the compensation signal echo1 from the sensing signal V₁ and outputs a result of the subtraction. According to the above description, the output of the first subtractor 250 a includes only a voltage drop caused by the current I₂ flowing through the second coil L₂ and the mutual inductance M between the first and second coils L₁ and L₂. That is, a noise component caused by the transmission data I₁ is removed from the sensing signal V₁.

The output of the first subtractor 250 a is provided to the hysteresis comparator 260 a to fully restore a signal transferred from the second terminal.

The first hysteresis comparator 260 a operates in synchronization with an enable signal enable1. The operation of the first hysteresis comparator 260 a is the same as that of the previously described hysteresis comparator 114 b of FIG. 6).

The first hysteresis comparator 260 a holds an input at the rising edge of the enable signal enable1. Thus, the signal transferred from the second terminal may be fully restored. The restored signal is provided as an output signal Dout1.

According to the above-describe configuration, the data transmitting and receiving apparatus 200 may perform interactive data communication through one channel. Thus, the data transmitting and receiving apparatus 200 may realize a relatively high data transfer rate and effective bandwidth.

Next, there is provided a data transmitting and receiving apparatus in which an inductor of FIG. 7 is replaced with a lower-cost resistor.

Reference is made to FIG. 8, which is a circuit diagram of a data transmitting and receiving apparatus 300 according to still another embodiment of the inventive concept. The data transmitting and receiving apparatus 300 includes a first terminal and a second terminal.

The first terminal of this example includes a first coil L₁, a first flip-flop 310 a, a first driver 320 a, a first replica driver 330 a, a first compensator 340 a, a first subtractor 350 a, and a first hysteresis comparator 360 a.

Similarly, the second terminal of this example includes a second coil L₂, a second flip-flop 310 b, a second driver 320 b, a second replica driver 330 b, a second compensator 340 b, a second subtractor 350 b, and a second hysteresis comparator 360 b.

The first terminal and the second terminal are substantially identical in configuration and operation. Therefore, this embodiment will be described with respect to the first terminal only.

In this embodiment, a compensator resistor R₁ is used as the first compensator 340 a.

When the input signal Din1 is received to the first flip-flop 310 a, the first flip-flop 310 a buffers the input signal Din1 and outputs the buffered signal. The first flip-flop 310 a operates in synchronization with a clock signal CLK1. The output of the first flip-flop 310 a is provided to the first driver 320 a and the first replica driver 330 a.

The first driver 320 a outputs transmission data I₁ with reference to the first flip-flop 310 a. The transmission data I₁ may be a current signal. When the transmission data I₁ flows through a coil, the transmission data I₁ is transmitted to the second terminal by inductance coupling.

The first replica driver 330 a outputs replica current I_(R1) with reference to the first flip-flop 310 a. The replica current I_(R1) is provided to the first compensator 340 a. When the replica current I_(R1) flows through the compensation resistor R₁, a voltage drop occurs at both ends of the compensation resistor R₁.

The subtractor 350 a receives a voltage at both ends of the first coil L₁ as a sensing signal V₁. In addition, the first subtractor 350 a receives a voltage at both ends of the compensation resistor R₁ as a compensation signal echo1.

Hereinafter, an operation principle of the first subtractor 350 a will now be described. First, components of the sensing signal V₁ are analyzed. At this point, the transmission data I₁ flows through the first coil L₁. Accordingly, the sensing signal V₁ includes a voltage drop caused by the transmission data I₁ and parasitic resistance, and a voltage drop caused by the transmission data I₁ and magnetic inductance of the first coil L₁.

The first coil L₁ is coupled with the second coil L₂ by mutual inductance M. Accordingly, the sensing signal V₁ includes a voltage drop caused by the current I₂ flowing through the second coil L₂ and the mutual inductance M.

Next, components of a compensation signal echo 1 are analyzed. The replica current I_(RI) flows through the compensation coil L_(RI). Accordingly, the compensation signal echo1 includes voltage drop (I_(R1)×R₁) caused by the replica current I_(R1) and the compensation resistor R₁.

A waveform of the compensation signal echo1 may be identical to that of a voltage drop caused by a parasitic resistor of the first coil L₁ through appropriate scaling. The compensation signal echo1 is subtracted from the sensing signal V₁. Accordingly, among the components of the sensing signal V₁, a component of voltage drop caused by the transmission data I₁ and the parasitic resistor may be removed.

However, although the above procedure is carried out, the sensing signal V₁ includes noise caused by the magnetic inductance of the first coil L₁. The transmission data I₁ of the first terminal and data I₂ transmitted from the second terminal have a phase difference of 180 degrees to remove the nose caused by the magnetic inductance of the first coil L₁.

This may be achieved through phase shift of clocks of the first flip-flop 310 a and the second flip-flop 310 b. That is, through the clock phase shift, an output of the first flip-flop 310 a is phase-shifted by +90 degrees and an output of the second flip-flop 310 b is phase-shifted by −90 degrees. As a result, the transmitted data I₁ and I₂ have a relative phase shift of 180 degrees.

When the transmitted data I₁ and I₂ have the relative phase shift of 180 degrees, noise caused by magnetic inductance may be removed. This is because the noise caused by magnetic inductance appears only at the rising edge of the first flip-flop 310 a. In contrast, the data I₂ transmitted from the second terminal appears only at the falling edge of the first flip-flop 310 a.

Accordingly, among the components of the sensing signal V₁, if only a component appearing at the falling edge of the first flip-flop 310 a is output, the noise caused by magnetic inductance is removed. A more detailed description associated with this will be presented later with reference to FIG. 9.

The first subtractor 350 a subtracts the compensation signal echo1 from the sensing signal V₁ and outputs a result of the subtraction. According to the above description, the output of the first subtractor 350 a includes only a voltage drop caused by magnetic inductance L₁ of the first coil L₁ and mutual inductance M of the first and second coils. That is, a component of the noise caused by a parasitic resistor of the first coil is removed from the sensing signal V₁.

The output of the first subtractor 350 a is provided to the first hysteresis comparator 360 a to fully restore a signal transferred from the second terminal.

The first hysteresis comparator 360 a operates in synchronization with the enable signal enable1. The operation of the first hysteresis comparator 360 a is the same as that of the previously described hysteresis comparator 114 b shown in FIG. 6.

The enable signal enable1 has a phase difference of 180 degrees with respect to a clock CLK1 of the first flip-flop 310 a. The first hysteresis comparator 360 a holds an input at the rising edge of the enable signal enable1. Thus, the noise caused by the magnetic inductance L1 may be removed and the signal transferred from the second terminal may be fully restored. The restored signal is provided as an output signal Dout1.

According to the above configuration, the data transmitting and receiving apparatus 300 may simultaneously perform interactive data communication through one channel. Thus, the data transmitting and receiving apparatus 300 may realize a relatively high data transfer rate and effective bandwidth.

Reference is made to FIG. 9, which is an exemplary operational timing diagram of the data transmitting and receiving apparatus shown in FIG. 8. Hereinafter, the operation of the apparatus of FIG. 8 will be further described with reference to FIGS. 8 and 9.

In this embodiment, a clock CLK1 of a first flip-flop 310 a and a clock CLK2 of a second flip-flop 310 b have a phase difference of 180 degrees with respect to each other. As a result, a signal I₂ received to a first coil L₁ from a second terminal (hereinafter referred to as “receiving data I₂”) and transmitted data I₁ have a phase difference of 180 degrees with respect to each other.

A component based on a parasitic resistor of a first coil (I₁*Rx), a component based on magnetic inductance of the first coil (L₁*(dI₁/dt)), and a component based on mutual inductance (M*(dI₂/dt)) are all added to the sensing signal V₁. The component based on mutual inductance (L₁*(dI₁/dt)) appears at the rising edge of the clock CLK1. To the contrary, the component based on mutual inductance (M*(dI₂/dt)) appears at the falling edge of the clock CLK1 because the transmission data I₂ has a phase difference of 180 degrees.

Since the compensation signal echo1 includes only a component of voltage drop caused by a resistor, the compensation signal echo1 has the same waveform as the component based on a parasitic resistor of a first coil (I₁*Rx). Through appropriate scaling, the compensation signal echo1 may be set to the intensity equivalent to the component (I₁*Rx).

A signal data1 is an output of the first subtractor 350 a. The signal data1 appears as a result of subtracting the compensation signal echo1 from the sensing signal V₁. The signal data1 is provided to the first hysteresis comparator 360 a.

The first hysteresis comparator 360 a removes the component based on magnetic inductance of the first coil (L₁*(dI₁/dt)) among components included in the signal data1. The component removal may be achieved by making the enable signal enable1 have a phase difference of 180 degrees with respect to the clock CLK1. This is because the transmission data I₁ appears at the rising edge of the clock CLK1 and the receiving data I₂ appears at the falling edge of the clock CLK2.

An output of the first hysteresis comparator 360 a is provided as an output signal Dout1. It may be confirmed that the output signal Dout1 is a noise-removed signal and a fully restored version of the second terminal input signal Din2.

According to the above configuration, the data transmitting and receiving apparatus 300 may simultaneously perform interactive data communication through one channel. Thus, the data transmitting and receiving apparatus 300 may realize a relatively high data transfer rate and effective bandwidth.

Reference is now made to FIG. 10, which illustrates a solid state drive (SSD) according to an embodiment of the inventive concept.

The SSD 1000 of this example includes a plurality of stacked semiconductor chips 1010. The semiconductor chips 1010 may include multiple NAND flash memory chips or the like, and one or more semiconductor chips 1010 may be a memory controller. In this embodiment each of the semiconductor memory chips includes a contactless communication terminal circuit 1010 a which is in accordance with one or more of the embodiments described above in connection with FIGS. 3-9, thereby allowing interactive data communication among the semiconductor chips 1010. Also shown in FIG. 10 are wirings for supplying power to the semiconductor chips 1010, although it is well understood that other known techniques for supplying power may be adopted.

While the inventive concept has been particularly shown and described with reference to exemplary embodiments thereof, it will be apparent to those of ordinary skill in the art that various changes in form and detail may be made therein without departing from the spirit and scope of the inventive concept as defined by the following claims. 

What is claimed is:
 1. A data transmitting and receiving apparatus comprising: a coil configured to transmit and receive data through inductive coupling, wherein a voltage drop across the coil constitutes a sensing signal; an input unit configured to generate transmission data and a replica signal in accordance with an input data signal, the transmission data being supplied to the coil; a replica unit configured to generate a compensation signal in accordance with the replica signal; and an output unit configured to extract reception data from the sensing signal using the compensation signal.
 2. The data transmitting and receiving apparatus of claim 1, wherein the input unit operates in synchronization with a clock signal and includes a flip-flop configured to buffer the input data signal and output a buffered signal as the replica signal.
 3. The data transmitting and receiving apparatus of claim 2, wherein the input unit further includes a driver configured to provide the transmission data to the coil in accordance with the buffered signal output from the flip-flop.
 4. The data transmitting and receiving apparatus of claim 2, wherein the output unit includes a subtractor configured to subtract the compensation signal from the sensing signal and output a result of the subtraction.
 5. The data transmitting and receiving apparatus of claim 4, wherein the output unit further includes a hysteresis comparator operating in synchronization with an enable signal and configured to output the reception data in accordance with the result of subtraction from the subtractor.
 6. The data transmitting and receiving apparatus of claim 5, wherein an effective input value of the hysteresis comparator is higher than a first reference value or lower than a second reference value.
 7. The data transmitting and receiving apparatus of claim 6, wherein the hysteresis comparator outputs a logic level HIGH as the output signal when the result of subtraction from the subtractor is higher than the first reference value.
 8. The data transmitting and receiving apparatus of claim 6, wherein the hysteresis comparator outputs a logic level LOW as the output signal when the result of subtraction from the subtractor is lower than the second reference value.
 9. The data transmitting and receiving apparatus of claim 5, wherein the replica signal has a same waveform as the input data signal and the replica unit includes a compensation coil.
 10. The data transmitting and receiving apparatus of claim 5, wherein the replica signal has a same waveform as the input signal and the replica unit includes a compensation resistor.
 11. The data transmitting and receiving apparatus of claim 10, wherein the enable signal has a phase difference of 180 degrees with respect to the clock signal.
 12. A data transmitting and receiving method comprising: receiving an input data signal; generating a transmission data and a replica signal in accordance with the input data signal; transmitting the transmission data inductively via an induction coil and receiving reception data inductively via the induction coil, wherein a voltage drop across the coil constitutes a sensing signal; generating a compensation signal in accordance with the replica signal; and extracting the reception data from the sensing signal using the compensation signal.
 13. The data transmitting and receiving method of claim 12, wherein the compensation signal is subtracted from the sensing signal to obtain a subtraction result.
 14. The data transmitting and receiving method of claim 13, wherein the subtraction result is applied to a hysteresis comparator operating in synchronization with an enable signal to obtain the reception data.
 15. The data transmitting and receiving method of claim 14, wherein generating the compensation signal includes applying the replica signal to a driver having an output connected across a compensation resistor, and wherein the transmission data has a phase difference of 180 degrees with respect to the reception data.
 16. A solid state drive (SSD) comprising a plurality of stacked semiconductor chips, at least one of which is memory chip, wherein each of the semiconductor chips includes a contactless communication terminal comprising: a coil configured to transmit and receive data through inductive coupling, wherein a voltage drop across the coil constitutes a sensing signal; an input unit configured to generate transmission data and a replica signal in accordance with an input data signal, the transmission data being supplied to the coil; a replica unit configured to generate a compensation signal in accordance with the replica signal; and an output unit configured to extract reception data from the sensing signal using the compensation signal.
 17. The SSD of claim 16, wherein at least one other of the semiconductor chips is a memory controller.
 18. The SSD of claim 16, wherein the memory chip is a NAND flash memory chip.
 19. The SSD of claim 16, wherein the input unit operates in synchronization with a clock signal and includes a flip-flop configured to buffer the input data signal and output a buffered signal as the replica signal.
 20. The SSD of claim 19, wherein the input unit further includes a driver configured to provide the transmission data to the coil in accordance with the buffered signal output from the flip-flop, wherein the output unit includes a subtractor configured to subtract the compensation signal from the sensing signal and output a result of the subtraction, and wherein the output unit further includes a hysteresis comparator operating in synchronization with an enable signal and configured to output the reception data in accordance with the result of subtraction from the subtractor. 